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Installing a cat flap on solid uPVC door panels or double-glazed sealed units is much simpler than it seems. If you don't possess the right tools or no experience, you will require a professional. Learn how to measure, mark and cut the space in the uPVC panel to make your cat flap. Also, how to make it weather and draft resistant. Safety A upvc door with cat flap is an excellent method to keep your pet safe while allowing them freedom of movement. These panels can be made from recycled materials and require minimal main